A. The word is aggregate.
-Jess K

b. His aggregate of expertise in Defense Against the Dark Arts helped Harry Potter defeat Lord Voldemort.

C. aggregate- formed by the collection of units or particles into a body, mass, or amount
This is from http://m-w.com
-Christa Coryea

--Cory M.
D. external image cd505aggregate03ws.jpg Julia

E.
Synonyms:
accumulated, added, amassed, assembled, collected, collective, combined, composite, corporate, cumulative, mixed, piled, total
Antonyms:
individual, part, particular
The synonyms are similar because they talk about a whole and the antonyms mean the opposite of a whole (a part)
(meg)
http://thesaurus.reference.com/browse/aggregate

F. I have been riding horses and taking lesson since I was nine years old. Over the years I have acquired much new information and learned a lot. I then use all that I have aggregated from my coach when I compete. In order to do well I must remember everything I have learned and put it all to use. So, I can relate to the word aggregate because I constantly aggregate new things and put them to good use. (emilyh)

G. In sixth grade, my middle school English class read, The Westing Game, a mystery novel by Ellen Raskin. That book kept me on the edge of my seat each day in class because we were all trying to solve the mysterious death of Mr. Westing. There are a lot of characters involved in this story and it is necessary to aggregate all of the clues and information you are constantly acquiring throughout the novel in order to make a valid conclusion. ---ginam.---